fix cascader input style

components/cascader/index.jsx

@@ -121,7 +121,7 @@ export default class Cascader extends React.Component {
           >
             <Input {...inputProps}
               placeholder={this.state.value && this.state.value.length > 0 ? null : placeholder}
-              className={`${prefixCls}-input ant-input ${sizeCls}`}
+              className={`${prefixCls}-input ${sizeCls}`}
               value={null}
               disabled={disabled}
               readOnly

components/cascader/style/index.less

@@ -5,7 +5,7 @@
 
 .@{cascader-prefix-cls} {
   font-size: @font-size-base;
-  &-input {
+  &-input.ant-input {
     display: block;
     cursor: pointer;
     width: 100%;